He ______ in Shanghai University for four years before he ______ Beijing.
| A．studied, had gone | B．had studied, went |
| C．has studied, goes | D．had studied, had gone |
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He ______ in Shanghai University for four years before he ______ Beijing.
| A．studied, had gone | B．had studied, went |
| C．has studied, goes | D．had studied, had gone |
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